lcd size

i have a question about the actual size of lcd's you can get, i have a 96 grand cherokee, and would like to keep everything in its stock spot. where the hu goes, is plenty wide enough, it just doesnt have the height that a lot of the 7 inch screens you guys talk about have. without moving the vents i have about 3.5 inches height, is there any way, i could move the buttons on the LCD's? or is there more of a "wide screen" that would fit within a 7x3.5 hole. if i were to use the lilliput, or one of those, i would either have to move my vents, or modify them, making them smaller, which i dont want to do, so anyhelp would be appreciated.